keypad and remote have new batterys,when the sun moves away from the garage door,the remote and keypad work finekeypad and remote have new batterys,when the sun moves away from the garage door,the remote and keypad work fine

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If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure one of the lights on the sensors is not flickering ever so slightly. Very hard to see sometimes. Tweak them a little. Make sure the sensors are tight in their brackets so that one of them isn't moving when the door is closing. Another thing to check is that the sun is not shining on one of the sensor lens. Use something so shade them without blocking the door. If this is the case you can move them back away from the door or make a shade out of the center roll of toilet tissue.

You cannot bypass the sensors but you can try reversing their position so that the sun isn't hitting the receiving unit. You can also move them back from the door or use something like the tube inside a roll of toilet tissue to shade the lens.

You might possibly have held the smart/learn button in too long and erased the code for the remote. Hold the button down on the remote and then press and immediately release the smart/learn button. This should program it for the remote. Now make sure the keypad is still working.

On the rear of your motor unit just to the left of all those white wires you will see a small light. If this light is flashing randomly it is normal. If it is flashing rapidly it is an indication of interference or you have keyed your remote. It really sounds like interference and you will have to do some more checking things.

315 mhz is the radio frequency and you cannot change that. In fact if you purchase a new opener you will get that same frequency.

Your opener was made by Chamberlain Mfg. Co. that also makes Liftmaster. That may be where the confusion comes in.

UNPLUG THE UNIT AND WAIT 5 MIN.
WHEN YOU PLUG IT BACK IN CLAER ALL CODES BY HOLDING DOWN THE PROGRAM BUTTON FOR 20 SECONDS.
NOW TRY TO PROGRAM EACH REMOTE AND KEYPAD - IF THERE IS STILL A PROBLEM CHANGE THE BATTERIES AND REPEAT THIS PROCEDURE.

Anytime a door opens and/or closes randomly or doesn’t work consistently I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

In your case the expansion of the wall in the afternoon may be enough to cause pressure on the wire to increase the problem – works in the morning but not the afternoon.

Also after you change the batteries you need to reprogram the remotes.